编辑答案:
这是我用于固定标头的代码,该标头在使用 jQuery 使用 smouth 滚动滚动到锚点时负责处理偏移量。
这是一个插图:https://jsfiddle.net/mmb5k7xb/1/
要查看脚本对不同高度的反应,只需在 html 部分更改菜单高度的值。
希望对你有帮助。
<script type="text/javascript">
var $ = jQuery.noConflict();
$(document).ready(function($) {
var menu_height = $('.menu').height(); // calulate the height of the menu
(function(document, history, location) {
var HISTORY_SUPPORT = !!(history && history.pushState);
var anchorScrolls = {
ANCHOR_REGEX: /^#[^ ]+$/,
OFFSET_HEIGHT_PX: menu_height, // Set the offset with the dynamic value
/**
* Establish events, and fix initial scroll position if a hash is provided.
*/
init: function() {
this.scrollIfAnchor(location.hash);
$('body').on('click', 'a', $.proxy(this, 'delegateAnchors'));
},
/**
* Return the offset amount to deduct from the normal scroll position.
* Modify as appropriate to allow for dynamic calculations
*/
getFixedOffset: function() {
return this.OFFSET_HEIGHT_PX;
},
/**
* If the provided href is an anchor which resolves to an element on the
* page, scroll to it.
* @param {String} href
* @return {Boolean} - Was the href an anchor.
*/
scrollIfAnchor: function(href, pushToHistory) {
var match, anchorOffset;
if(!this.ANCHOR_REGEX.test(href)) {
return false;
}
match = document.getElementById(href.slice(1));
if(match) {
anchorOffset = $(match).offset().top - this.getFixedOffset();
$('html, body').animate({ scrollTop: anchorOffset});
// Add the state to history as-per normal anchor links
if(HISTORY_SUPPORT && pushToHistory) {
history.pushState({}, document.title, location.pathname + href);
}
}
return !!match;
},
/**
* If the click event's target was an anchor, fix the scroll position.
*/
delegateAnchors: function(e) {
var elem = e.target;
if(this.scrollIfAnchor(elem.getAttribute('href'), true)) {
e.preventDefault();
}
}
};
$(document).ready($.proxy(anchorScrolls, 'init'));
})(window.document, window.history, window.location);
});
</script>